Hi,
you can change the default settings by using the timeout command:
timeout conn 1:00:00 half-closed 0:10:00 udp 0:02:00 rpc 0:10:00 h225 0:00:00
timeout h323 16:00:00 mgcp 0:05:00 sip 0:30:00 sip_media 0:02:00
This should solve your problem.
Did it help? Then please rate it.
Martin